I suppose it all depends on the size of the spreader plates they install Matt, if it goes from one bolt to another then this seems to be exceptable.
The reason I say this is, when I bought my Tow bar, I noticed it only had 2 large bolts for the chassis, then another 2 went to the rear bumper brackets, but the front end of the Tow bar (right underneath towards the front) the 2 bolts that held it up Had to go through the floor pan, but inside the boot I had a spreader plate that went from one bolt right the way across to the other bolt.
Now this Tow bar is a witter, there were even dimples in the boot provided by the manufactures on where to drill the holes.
So maybe that company you know, puts longer spreader bars in.